The number of paramagnetic metal complex species among \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+},{\left[\mathrm{Co}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}\), \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},\)\({\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right]}^{3-}\) and \({\left[{\mathrm{FeF}}_{6}\right]}^{3-}\) with same number of unpaired electrons is _______

[JEE Main 2025, 7 Apr (Shift 2)]

Question

The number of paramagnetic metal complex species among \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+},{\left[\mathrm{Co}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}\), \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},\)\({\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right]}^{3-}\) and \({\left[{\mathrm{FeF}}_{6}\right]}^{3-}\) with same number of unpaired electrons is _______

[JEE Main 2025, 7 Apr (Shift 2)]

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